Modifying prototypes in JavaScript

JavascriptWeb DevelopmentObject Oriented Programming

Following is the code for modifying prototypes in JavaScript −

Example

 Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 20px;
      font-weight: 500;
      color: blueviolet;
   }
</style>
</head>
<body>
<h1>Modifying prototypes in JavaScript</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to see the original and modified prototype function</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   function Person(name, age, occupation) {
      this.name = name;
      this.age = age;
      this.occupation = occupation;
   }
   Person.prototype.displayInfo = function () {
      return `Name: ${this.name} Age: ${this.age} Occupation: ${this.occupation}<br>`;
   };
   let person1 = new Person("Shawn", 20, "student");
   let person2 = new Person("Rohan", 25, "Manager");
   BtnEle.addEventListener("click", () => {
      resEle.innerHTML =
      "Before Modifying prototype <br>" +
      person1.displayInfo() +person2.displayInfo();
      Person.prototype.displayInfo = function () {
         return `Occupation: ${this.occupation} Age: ${this.age} Name: ${this.name} <br> `;
      };
      resEle.innerHTML +="<br>After Modifying prototype <br>" +
      person1.displayInfo() +person2.displayInfo();
   });
</script>
</body>
</html>

Output

On clicking the ‘CLICK HERE’ button −


raja
Published on 20-Jul-2020 08:03:19
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